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Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)